Zardnaar
Legend
You bought three books. An RPG is one book (except D&D which is three books).
I bought a car this year. It also cost more than an RPG. It, like your purchase, wasn’t an RPG. So let’s stay on target, eh?
Well all the shops here only sell 5E. D&D has 3 big advantages.
1. Name recognition
2. Dominant market position.
3. Popular genre (fantasy).
Alot of D&D players don't like RPGs they just like D&D.
D&D is still fairly niche. Any rpg that's not D&D is even smaller than that and competes with every other RPG that's not D&D.
5Es what 80% of the market or more?
Even when it was out of print 2012-2014 the market just shrunk.